squid(8) on Linux
The text 291ed3cc4452, as Debian 2.1 (Slink) shipped it.
Internet ObjectCache
Flags it lists
-
-C -
-D -
-F -
-N -
-R -
-V -
-X -
-Y -
-a -
-d -
-f -
-h -
-k -
-s -
-u -
-v -
-z